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llvm-mirror/test/Transforms/InstCombine/simplify-libcalls.ll
Sanjay Patel d4eedb2312 [Analysis] improve function signature checking for snprintf 
The check for size_t parameter 1 was already here for snprintf_chk,
but it wasn't applied to regular snprintf. This could lead to
mismatching and eventually crashing as shown in:
https://llvm.org/PR50885

(cherry picked from commit 7f5555776513f174729a686ed01270e23462aaf7)
2021-08-02 22:58:39 -07:00

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LLVM
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; RUN: opt -S < %s -mtriple=unknown -instcombine -instcombine-infinite-loop-threshold=2 | FileCheck -check-prefixes=CHECK,CHECK32 %s
; RUN: opt -S < %s -mtriple=msp430 -instcombine -instcombine-infinite-loop-threshold=2 | FileCheck -check-prefixes=CHECK,CHECK16 %s
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f80:128:128-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32-S32"
@G = constant [3 x i8] c"%s\00" ; <[3 x i8]*> [#uses=1]
declare i32 @sprintf(i8*, i8*, ...)
define void @foo(i8* %P, i32* %X) {
call i32 (i8*, i8*, ...) @sprintf( i8* %P, i8* getelementptr ([3 x i8], [3 x i8]* @G, i32 0, i32 0), i32* %X ) ; <i32>:1 [#uses=0]
ret void
}
; PR1307
@str = internal constant [5 x i8] c"foog\00"
@str1 = internal constant [8 x i8] c"blahhh!\00"
@str2 = internal constant [5 x i8] c"Ponk\00"
define i8* @test1() {
%tmp3 = tail call i8* @strchr( i8* getelementptr ([5 x i8], [5 x i8]* @str, i32 0, i32 2), i32 103 ) ; <i8*> [#uses=1]
ret i8* %tmp3
; CHECK-LABEL: @test1(
; CHECK: ret i8* getelementptr inbounds ([5 x i8], [5 x i8]* @str, i32 0, i32 3)
}
declare i8* @strchr(i8*, i32)
define i8* @test2() {
%tmp3 = tail call i8* @strchr( i8* getelementptr ([8 x i8], [8 x i8]* @str1, i32 0, i32 2), i32 0 ) ; <i8*> [#uses=1]
ret i8* %tmp3
; CHECK-LABEL: @test2(
; CHECK: ret i8* getelementptr inbounds ([8 x i8], [8 x i8]* @str1, i32 0, i32 7)
}
define i8* @test3() {
entry:
%tmp3 = tail call i8* @strchr( i8* getelementptr ([5 x i8], [5 x i8]* @str2, i32 0, i32 1), i32 80 ) ; <i8*> [#uses=1]
ret i8* %tmp3
; CHECK-LABEL: @test3(
; CHECK: ret i8* null
}
@_2E_str = external constant [5 x i8] ; <[5 x i8]*> [#uses=1]
declare i32 @memcmp(i8*, i8*, i32) nounwind readonly
define i1 @PR2341(i8** %start_addr) {
entry:
%tmp4 = load i8*, i8** %start_addr, align 4 ; <i8*> [#uses=1]
%tmp5 = call i32 @memcmp( i8* %tmp4, i8* getelementptr ([5 x i8], [5 x i8]* @_2E_str, i32 0, i32 0), i32 4 ) nounwind readonly ; <i32> [#uses=1]
%tmp6 = icmp eq i32 %tmp5, 0 ; <i1> [#uses=1]
ret i1 %tmp6
; CHECK-LABEL: @PR2341(
; CHECK: i32
}
define i32 @PR4284() nounwind {
entry:
%c0 = alloca i8, align 1 ; <i8*> [#uses=2]
%c2 = alloca i8, align 1 ; <i8*> [#uses=2]
store i8 64, i8* %c0
store i8 -127, i8* %c2
%call = call i32 @memcmp(i8* %c0, i8* %c2, i32 1) ; <i32> [#uses=1]
ret i32 %call
; CHECK-LABEL: @PR4284(
; CHECK: ret i32 -65
}
%struct.__sFILE = type { i8*, i32, i32, i16, i16, %struct.__sbuf, i32, i8*, i32 (i8*)*, i32 (i8*, i8*, i32)*, i64 (i8*, i64, i32)*, i32 (i8*, i8*, i32)*, %struct.__sbuf, i8*, i32, [3 x i8], [1 x i8], %struct.__sbuf, i32, i64, %struct.pthread_mutex*, %struct.pthread*, i32, i32, %union.anon }
%struct.__sbuf = type { i8*, i32, [4 x i8] }
%struct.pthread = type opaque
%struct.pthread_mutex = type opaque
%union.anon = type { i64, [120 x i8] }
@.str13 = external constant [2 x i8] ; <[2 x i8]*> [#uses=1]
@.str14 = external constant [2 x i8] ; <[2 x i8]*> [#uses=1]
define i32 @PR4641(i32 %argc, i8** %argv) nounwind {
entry:
call void @exit(i32 0) nounwind
%cond392 = select i1 undef, i8* getelementptr ([2 x i8], [2 x i8]* @.str13, i32 0, i32 0), i8* getelementptr ([2 x i8], [2 x i8]* @.str14, i32 0, i32 0) ; <i8*> [#uses=1]
%call393 = call %struct.__sFILE* @fopen(i8* undef, i8* %cond392) nounwind ; <%struct.__sFILE*> [#uses=0]
unreachable
}
declare %struct.__sFILE* @fopen(i8*, i8*)
declare void @exit(i32)
define i32 @PR4645() {
entry:
br label %if.then
lor.lhs.false: ; preds = %while.body
br i1 undef, label %if.then, label %for.cond
if.then: ; preds = %lor.lhs.false, %while.body
call void @exit(i32 1)
br label %for.cond
for.cond: ; preds = %for.end, %if.then, %lor.lhs.false
%j.0 = phi i32 [ %inc47, %for.end ], [ 0, %if.then ], [ 0, %lor.lhs.false ] ; <i32> [#uses=1]
unreachable
for.end: ; preds = %for.cond20
%inc47 = add i32 %j.0, 1 ; <i32> [#uses=1]
br label %for.cond
}
@h = constant [2 x i8] c"h\00" ; <[2 x i8]*> [#uses=1]
@hel = constant [4 x i8] c"hel\00" ; <[4 x i8]*> [#uses=1]
@hello_u = constant [8 x i8] c"hello_u\00" ; <[8 x i8]*> [#uses=1]
define i32 @MemCpy() {
%h_p = getelementptr [2 x i8], [2 x i8]* @h, i32 0, i32 0
%hel_p = getelementptr [4 x i8], [4 x i8]* @hel, i32 0, i32 0
%hello_u_p = getelementptr [8 x i8], [8 x i8]* @hello_u, i32 0, i32 0
%target = alloca [1024 x i8]
%target_p = getelementptr [1024 x i8], [1024 x i8]* %target, i32 0, i32 0
call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 2 %target_p, i8* align 2 %h_p, i32 2, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 4 %target_p, i8* align 4 %hel_p, i32 4, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 8 %target_p, i8* align 8 %hello_u_p, i32 8, i1 false)
ret i32 0
; CHECK-LABEL: @MemCpy(
; CHECK-NOT: llvm.memcpy
; CHECK: ret i32 0
}
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i1) nounwind
declare i32 @strcmp(i8*, i8*) #0
define void @test9(i8* %x) {
; CHECK-LABEL: @test9(
; CHECK-NOT: strcmp
%y = call i32 @strcmp(i8* %x, i8* %x) #1
ret void
}
; PR30484 - https://llvm.org/bugs/show_bug.cgi?id=30484
; These aren't the library functions you're looking for...
declare i32 @isdigit(i8)
declare i32 @isascii(i8)
declare i32 @toascii(i8)
define i32 @fake_isdigit(i8 %x) {
; CHECK-LABEL: @fake_isdigit(
; CHECK-NEXT: [[Y:%.*]] = call i32 @isdigit(i8 %x)
; CHECK-NEXT: ret i32 [[Y]]
;
%y = call i32 @isdigit(i8 %x)
ret i32 %y
}
define i32 @fake_isascii(i8 %x) {
; CHECK-LABEL: @fake_isascii(
; CHECK-NEXT: [[Y:%.*]] = call i32 @isascii(i8 %x)
; CHECK-NEXT: ret i32 [[Y]]
;
%y = call i32 @isascii(i8 %x)
ret i32 %y
}
define i32 @fake_toascii(i8 %x) {
; CHECK-LABEL: @fake_toascii(
; CHECK-NEXT: [[Y:%.*]] = call i32 @toascii(i8 %x)
; CHECK-NEXT: ret i32 [[Y]]
;
%y = call i32 @toascii(i8 %x)
ret i32 %y
}
declare double @pow(double, double)
declare double @exp2(double)
; check to make sure only the correct libcall attributes are used
define double @fake_exp2(double %x) {
; CHECK-LABEL: @fake_exp2(
; CHECK-NEXT: [[Y:%.*]] = call double @exp2(double %x)
; CHECK-NEXT: ret double [[Y]]
%y = call inreg double @pow(double inreg 2.0, double inreg %x)
ret double %y
}
define double @fake_ldexp(i32 %x) {
; CHECK32-LABEL: @fake_ldexp(
; CHECK32-NEXT: [[Z:%.*]] = call double @ldexp(double 1.0{{.*}}, i32 %x)
; CHECK32-NEXT: ret double [[Z]]
; CHECK16-LABEL: @fake_ldexp(
; CHECK16-NEXT: [[Y:%.*]] = sitofp i32 %x to double
; CHECK16-NEXT: [[Z:%.*]] = call inreg double @exp2(double [[Y]])
; CHECK16-NEXT: ret double [[Z]]
%y = sitofp i32 %x to double
%z = call inreg double @exp2(double %y)
ret double %z
}
define double @fake_ldexp_16(i16 %x) {
; CHECK32-LABEL: @fake_ldexp_16(
; CHECK32-NEXT: [[Y:%.*]] = sext i16 %x to i32
; CHECK32-NEXT: [[Z:%.*]] = call double @ldexp(double 1.0{{.*}}, i32 [[Y]])
; CHECK32-NEXT: ret double [[Z]]
; CHECK16-LABEL: @fake_ldexp_16(
; CHECK16-NEXT: [[Z:%.*]] = call double @ldexp(double 1.0{{.*}}, i16 %x)
; CHECK16-NEXT: ret double [[Z]]
%y = sitofp i16 %x to double
%z = call inreg double @exp2(double %y)
ret double %z
}
; PR50885 - this would crash in ValueTracking.
declare i32 @snprintf(i8*, double, i32*)
define i32 @fake_snprintf(i32 %buf, double %len, i32 * %str) {
; CHECK-LABEL: @fake_snprintf(
; CHECK-NEXT: [[CALL:%.*]] = call i32 @snprintf(i8* undef, double [[LEN:%.*]], i32* [[STR:%.*]])
; CHECK-NEXT: ret i32 [[CALL]]
;
%call = call i32 @snprintf(i8* undef, double %len, i32* %str)
ret i32 %call
}
attributes #0 = { nobuiltin }
attributes #1 = { builtin }
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